How do I paint old wood floors without using a primer?

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I moved into this home a few years ago, the previous owner redid the floors in the bedrooms but not the hallway. I want to paint them light grey with as little effort as possible. A rustic look is fine with me. Anything will be an improvement. Thank you in advance for your suggestions..

q how to paint old wood floors without using a primer
q how to paint old wood floors without using a primer
  11 answers